Home
Class 11
BIOLOGY
What is /are true about heart wood A. ...

What is /are true about heart wood
A. It does not help in water conduction
B. It is also called alurnum
C. It is dark in colour but very soft
D. It has tracheary element which are filled with tannin, resin, etc.

A

B, C and D

B

A and D

C

B and D

D

A, B and C

Text Solution

Verified by Experts

The correct Answer is:
B
Promotional Banner

Topper's Solved these Questions

  • ANIMAL KINGDOM

    ERRORLESS |Exercise Animal Kingdom|1230 Videos

Similar Questions

Explore conceptually related problems

Which of the following statements are correct about heartwood? (i). It does not help in water conduction (ii). It is also called alburnum (iii). It is light in colour and is very soft (iv). It has tracheray elements which are filled with tannins, resins etc.

Which are true about the following statements about kangaroo rats (a) They have dark colour, high rate of reproduction and excrete solide urine (b) They do not drink water, breathe at slow rate, and have their body covered with thick hair (c) The feed on dry seeds and do not require drinking water (d) They excrete very concentrated urine and do not use water to regulate body temperature

Water and dissolved minerals get into the root hair of a plant by a process called A and enter the conducting tissue B. The C helps the water and dissolved minerals to move up through the tissue B in roots and stem, and reach the leaves of a plant. In the leaves food is made by a process D. This food is then transported to all the parts of a plant through tissue E. The process of distributing food made in the leaves to all the parts of the plant is called F. (a) What are (i) A (ii) B (iii) C (iv) E, and (iv) F ? (b) Which tissue is made up of living cells : B or E ? (c) Name one substance (other than oxygen) which is transported by tissue A in the human body. (d) Which two components of tissue A are the cells without nucleus ? (e) Name any two organisms (animals) which do not have liquid like A in their body.

To a block of wood, a metal sphere is attached with the help of a string and the whole arrangement is dropped in a water container as shown in the figure. If the wooden block floats in water, then which of the following statements is true? (a) Upthrust on the wooden block is equal to its weight. (b) Upthrut on the metal sphere is equal to its weight. (c) Tension in the string is equal to its weight. of metal sphere. (d) Tension in the string is less than the weight of metal sphere.

In a village, farmers started cultivating crops all around a lake which was always filled with water. They added lot of materials W to the soil in their fields to increase the yield of crops. Soon they found that the whole surface of water in the lake was covered with a green layer made up of tiny organisms X. After some time, the fish present in the lake started dying in large numbers they could not get sufficient Y due to a process Z which had occurred in lake water and drained out all the Y present in the water of lake. (a) What do you think materials W are ? (b) Name (i) X, and (ii) Y. (c ) What is the process Z known as ? (d) What happens during the process Z which uses up all the Y present in lake water ? (e) What does this example tell us about the use of materials like W ?

In the following passage at certain points you are given a choice of three words one of which fits the meanning of the passage . Choose the best words . Mark the lettter , viz (a) , (b) or (c) Solve for 93 We know that the average depth of the sea is about two and a half miles, but in a few places it is very deep indeed-over six miles. The air presses upon our bodies with a weight of about fifteen pounds to the square inch at 82 (a) sea-water/(b) sea-level/(c) sea-bed We are used to this air pressure and 83. (a) do/ (b) did /(c) does not notice it. In the sea this 84(a) weight/ (b) volume/ (c) pressure is doubled at a depth of thirty-five feet, ant it 85. (a) expand (b) decreases (c) increases at this rate for greater depths. In the great deeps 86. (a) off (b) of (c) on the Philippine Islands, a man would be squeezed and utterly crushed by a pressure of 87. (a) severe (b) several (c) sheer tons per square inch. The pressure near the ocean floor is 88. (a) such (b) not (c) so such great that if you were to weigh a piece of wood and 89. (a) measure (b) follow (c) lower it to a great depth and then pull it 90. (a) up again it would no longer float, 91. (a) but (b) for (c) when it would have become waterlogged. All the tiny wood cells and cavities 92. (a) should (b) could (c) would have burst and become filled with water. We 93. (a) know (b) have known (c) are knowing that live at a depth of three miles and more and we wonder 94. (a) why (b) how (c) what this can be. The bodies of animals down 95. (a) here (b) where (c) there are almost entirely filled with water, and 96. (a) this (b) these (c) thus saves them from being crushed. However, many of 97. (a) such (b) those (c ) there animals contain some gases as well, for 98. (a) then (b) since (c) when they are captured in nets and drawn 99. (a) on (b) to (c) from the surface these gases expand so much that the animal 100. (a) immediately (b) eventually (c) actually explodes. Its body is torn to shreds as it 101.(a) bursts. (b) jumps (c) lands.